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→Обработка запроса
<pre>
request(l, r) left = l / len right = r / len end = (left + 1) * len - 1 sum = 0
if left == right for i = l to r sum += A[i] else for i = l to end sum += A[i] for i = left + 1 to right - 1 sum += B[i] for i = right * len to r sum += A[i]
</pre>
